Auxiliary power take-off for tractors



Nov. 22, 1949 w. c. RosENTHAl. ETAL 2,488,741

' AUXILIARY POWER TAKE-OFF FOR TRACTORS I Filed Jan. 11, 1947 v 2Sheets-Sheet l Nqv. 22, 1949 W. C. ROSENTHAL ET AL AUXILIARY POWERTAKE-OFF FOR TRACTORS Filedv Jan. 11, 1947 ,Zg, a

2 Sheets-Sheet 2 Patented Nov. 22,y 1949 AUXILIARY POWER TAKE-OFF FORTRACTORS William C. Rosenthal and Ralph C. Boyle, Chicago, Ill.,assignors to International Harvester Company, a corporation of NewJersey Application January 11, 1947, Serial No. 721,516

Claims.

1 This invention concerns Y tractors having a power take-off shaftadapted for driving attachments of any various conventional power drivenunits, and more particularly concerns a power take-off unit which isitself drivable from the lnormal power take-o shaft when the unit isdetachably mounted in association therewith upon the tractor.

An object of this invention is the provision of a power take-01Tarrangement wherein there is a power take-off unit detachably mountableon a tractor to receive power from an outwardly prokjecting powertake-olf shaft which is also serviceable to transmit power as a normalpower take-off V.shaft when the unit is detached.

A further object is the provision of a detachable power take-off unit ofwhich the casing comprises a lubricant-containing gearing chamber havinga sealed bearing in a side wall thereof and a drive shaft for thegearing of said unit projecting through the sealed bearing for drivingconnection with the power take-off shaft of the tractor when the unit ismounted on the tractor.

Another object is the provision of a detachable power take-on" unit ofwhich a drive shaft thereof projects outwardly from alubricant-containing casing chamber through a sealed bearing and into atubular protective shroud which is serviceable as a means for attachingthe unit to the tractor.

Still a further object is the provision of a power take-olf arrangementemploying a detachably mountable power take-off unit according to thepreceding object, wherein the power take-off unit drive shaft istelescopically associatable with the tractor power take-off shaft toestablish a driving connection therewith pursuant to placement of theunit into position for attachment to the ftractor, and wherein saidshroud encloses the connecting portions of the tractor power take-offshaft and of the power take-off unit drive shaft when the unit ismounted on the tractor.

The above and other desirable objects and ad- Figure. 1 is a fragmentaryplan view showing the rear portion and traction wheels of a tractor.

Figure 2 is a horizontal sectional `view taken through a power take-offunit constituting a preferred embodiment of the present invention.

' Figure 3 is a sectional view taken on the line .l 3-3 of Figure 2,illustrating a means for attaching the unit to the rear wall of thetractor dif- .'.I- Eerential gearing compartment.

Ved to be power driven.

The drawings illustrate a typical installation of the present powertake-off arrangement. In Figure 1 there is shown a rear body portion IIof a wheel-type tractor. Body II is connected with a differential gearhousing I2 through a change-speed gear box I3, and traction Wheel driveaxles (not shown) for driving rear traction wheels I4 are conventionallycontained within drivingaxle housings I5 and IB.

A rear wall I'I of the differential housing I2, which constitutes alubricant-containing compartment, provides support `for a detachablymounted belt pulley type of power take-off unit I8. A belt pulley I9 ofthe mountable power take-off unit I8 receives power indirectly from apower take-off shaft 2l, Figures 2 and 3, which has a portion extendingexteriorly of the compartment Wall I1 through asealed bearing structure22.

The sealed bearing structure 22 is carried by a plate 23 which is heldin place over an opening 24 in the wall I'I by capscrews 25 and 26. Acircular flange 2'! extending about one end of an opening in the plate23 supports a ball bearing unit 28, whereas a pilot flange 23 of theopposite side of the plate 23 encloses an annular seal device 3| toprovide insurance against loss of lubricant from thelubricant-containing compartment I2 when the power take-orf unit I8 isdetached. When the power take-off unit I8 is detached, the outwardlyprojecting end portion of the power take-olf shaft 2| is connectibleconventionally with any type of apparatus adapt- A hole 32 in theexterior end portion of the shaft 2l facilitates connection of apparatuswith said shaft. Drive attaching means in the form of splines 33 on theshaft facilitate telescopio drivingconnection with a drive shaft 34 ofthe power take-off unit.

The power take-olf unit casing includes a lubricant-containing chamber35 and a tubular shroud 36 connected onto the front Wall of theV chamber35. Y An Opening 31 in the front side wallof the chamber 35 pilots arear or inner end portion of the tubular shroud 3B, While the capscrews38 pass through a flange 39 of the shroud for attaching the same to thefront wall of the chamber 35. A sealed bearing or bearing structure forthe shaft 34 includes a ball bearing unit 4I and an annular sealingelement 42. An internally splined extension 43 of thek shaft 34 isbrazed to the .main portion of the shaft as indicated at 44. Internallysplined shaft extension 43 is telescopically associated with the splinedexterior portion of the power take-olf shaft 2| pursuant to axialmovement of the shroud 36 over the exterior portion of the shaft 2| forplacing a circular interior periphery 45 of the shroud onto the pilotflange 29 in readiness for the insertion and tightening of the capscrews26 for mounting the unit on the tractor.

A pulley shaftorlipower-take-off driven shaft, 46, of the"powerta'keffunit is ljournaled vinea bearing unit 4l and also in a sealed bearingstructure 48 which includes a ball bearing unit 49 andl` an annularsealing device 5|. The beltepulley-YIS4 is constrained for rotation withthe driven shaft 46. Power transmitting gearing in the form of bevelgears 52 and 43 con-strainedAll respectively for rotation with theshafts*34'and"lli'serve'to'l transmit driving force from the former to'the latter.

An advantage of considerable importance is obtained because of nolubricant-containing chambers or compartments being exposed upon-'eitherthe tractor or power-take-offunitwhen fthe-latter'iis detachedfrom thei tractor. 'Sealed bearings '4'|-`42 'fof the power -takeoifunit `|8 #prevents leakage oflubricant into the `tubular fshroud 36irrespective of whether the power take-off unit isvdetached f to leavethe t exterior :portion of the pofwerktakeeoff vshaft 2| Vexposed for'alternative-attachment Vof otherpower.` driven equipment. Whenlthe powertake-oft'unit removedg the sealed --bearingf structure 'v3 i--28 pre-"takeeo'ffshaft journaled in said bearing and-pro-:l

jecting therethrough outwardlyffromwithin said compartment toprovi'de an'exterior shaft p0r- -tion capable of beingfcoupled onto-'as a-power ftransmitter,` aA power" take-off unit comprisingga lhavingi a sidewallandalso includinga tubular attaching? shroud projecting from-such'last' mentione'd side wall, said chamber sidewallcontain- 'ing an'opening-asealedbearingV mounted in said "Casing includingv alubricantcontaining chamber 550 ting gearing in such chamber, a tubularattaching shroud projecting from such side wall in regstry with saidopening, a sealed bearing assembled rigidly relatively to said wall inregistry with said opening and shroud, a power take-01T drive shaftjournaled in said bearing, said power-take- `oir-"drive shaft beingconmact'edwith the gearing vins-said 'chamber and' projectingWhough saidbearing into said shroud, said drive shaft being tlescopicallyattachable in driving relation with Athe exterior portion of said powertake-off shaft -ipursuant to movement of the shroud into mountingattachment with the tractor, and said shroud being coopera-bleowith thetractor for enclosing the telescopicallyattached portions of said shafts'when the unit is mounted upon the tractor.

3. In a.power take-off unit detachably mountable. on a tractor toreceive power from an outwardly projecting tractor power take-oir shaftwhich is also serviceable to transmit power as afno'rmalpowerltake-off.shaft whenu said unit is detached,-y a powertake-01T unitcasing-including la Ilubricant-containing gearing' chamberhaving -a-side wallwitha shaft-accomrnodating opening, @powertransmitting gearing.v in suchi-"chambena :sealed bearing structureassembledv with 'such jsidewall of? said 1' chamber and! in registrywith said wall opening, a power-takeffi'drivenShaft V.operab'lyconnecting i with the gearingA lin l ysaid chamber and-'projectingthroughfsaidfbearing -rstructure,a second sealed bearingstr-ucturelin a.side wallofl said'vchamber; af'drivev shaftjournaled; in the second'bearingtstructure; said drive shaftzbeingioperably* connected withlth'egearing and projecting through the second bearing structure, and atubularf attachingshroudprojecting fro'mz-said'Acompartment-in-fradiallyr spacedi embracing relation with the i'projectingi portion #of sai-d' "drivel shaft;` said' attachingishroud:being fattacha'b'le to thef tractor? for: mounting'. thef'power 2take'-oi;nnit thereon,=and.`sai'dr proj ectinglportion ooi* theiidriveshaft'rbeingadaptedfor drivingcouplingfrelation with'lsaid.poweritake-oif-'shaftpr- :suantitoxthe .mounting ofthe'uniton thetractor.

\ 4. .In a power taketofF-unitldetachably mou-ntableaonatractor to:rec'eivellp'owervl from arl-Cout- -wardly projecting ftra'ctor :powertakeoi shaft v wliioh is= also* serviceableto transmitrpowerasfia normal'poweri take-offlshaft when-*saidY -uriitis detached, a power take-offunit casing including 'far lubricantrcontaining "gearing chamber havingfa'i sidel wall, r power-transmission# gearing -inasad cchamber, vaisealedf bearingfstructure in` such side iwall' of. said Chambon a;'driven shaft Ejourna-l'e'd "shroud-in axial registrywithtl'ietchamloersidei55 in Sad'bearing"Structurehavinginteriorardf'ex-"wallfopening, a powerltakeeo'ff 'unit drive-"shaft 1 journaled in saidshroud-mounted bearing and projecting' therethroughl from :said: chamberinto said shroud; said tubularL attachingshroud havteriorl portionsrespectively' driVin'gl'yf connected 1 with said @gearing and projectingoutwardly f Isaid 'cham-loer through saidbearingstructureyafwall-'otsaid chamber? having' a-n opening, a* tubuing amA inner=pei-ipherg1 131101-, Sufacefsudabletcollar attaching. shroudattachableto"saidchamber "complementally onto the' pilot angefthetractorV compartment incident to mountingl the' power l takeeoiuniton the-` tractor; aridv saidffdriveY shaft being-'telescopicallyattachalixleI indrivingfrelation vside wallinaxial registration withsaid opening,

sealed bearingrneans in an-end portion' ofsad shroud assembled with thechamber-side wall, a spower''take-c' `if-*d1rive *shaftl journaled insaid'bear- "withithe exterior portionfof;the-powerftake-oisngmeansfandfhavinsanl inner endportion'pro- -shaftr pursuanti to projection`v of therfshroud into lmountedrelation with the tractor.

`wax-:ily projecting'tractor'power take-off: shaft770 15o-:assemblyor"disassernbly' of saidshroudwith f which is "also serviceabletof-transmit powerf as a normal fpower take-off shaft when Isaidlunithisdetactiedg' a; power taleeo nnitcasing including ai lubricantecontainingEgearin'g 'chamber -having the 'chamber side-fwall;l "anouteren'dportion"of `isaidr' shroud-'being attachafkileiti/ith theA tractor for'moui'iting theV power take-off unit" on thel tractor with 'theoutwardly "projecting ypower takeeo' -a=sideWall-havingzana'opening,:powerftransmitshaft disposedwithinfsadshroud,@andanouter end portion of said power take-off driveshaft being telescopically assemblable in driving relation with thetractor power take-off shaft pursuant to disposal of the latter into theshroud.

5. In a power take-off for a tractor having a lubricant-containingcompartment with a sealed bearing in a side wall thereof, a powertake-off shaft journaled in said bearing and projecting therethroughoutwardly from within said compartment, said shaft having driveattaching means upon a portion thereof exterior to the compartment; apower take-off unit comprising a casing including a lubricant-containingchamber having a side wall with a shaft-accommodating opening therein,said casing also comprising a tubular attaching shroud axiallyregistering With said opening and projecting from such chamber sidewall, a sealed bearing in said casing adjacently to such chamber sidewall and in axial registry with said opening and said shroud, apower-take-oiT-unit drive shaft journaled in the last-mentioned bearingand projecting from `said chamber through said opening into said attach-REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 1,090,383 Cantrell et al. Mar.17, 1914 1,417,720 Dunham May 30, 1922 1,487,445 Dickinson Mar. 18, 19241,680,306 Stewart Aug. 14, 1928 1,712,190 Yates May 7, 1929 1,722,284Fisher July 30, 1929

